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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2571731c97b2d0a0ab6bf7b07434dbbdc851a3f4ef3578cb2de36c286d2bc85' 
  AND token = 'GKdQV2WRVt7/PBaxiBlxKmFZb46M3elJ+9EUv612KGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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