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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ea9a4f762302fd69bc2f1bfa3a7b6a3f9e402815201bab8dd5a7cf177b19195' 
  AND token = '320/RH9+ORJbm9yZ2GTi9fWOmtZPacrgwe2+JBAFzV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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