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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7db73fb78215e1b83febc03b2390a208b28be3e03441b0aede7fa73466d13cc' 
  AND token = 'wK9ReqAFhw8vf8L1gFPfaB2DAQIdtfwKBjV3D7EhE8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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