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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bb718f391d84201014c6543dbc8499c138041f10bd02fa639bdb53d2a13ed3e' 
  AND token = 'GbheRYv/hEqxQlUvuFBlXNGFThzNAa1zFepR44S2Utk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}