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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba76cacfbd558cf89f99c4ea262467f96faa263918af5f8a194d4879c449b181' 
  AND token = 'Cgpnz3Gezj2lixGIRcuH6j1znsBa+O7a3a+fh7ofels=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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