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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2418df3c3080b2502657d74915f666184822e6d954d3fdf51d09caca4bddbfc2' 
  AND token = 'ZPiLWBedUD0OXicPlLd/WuX87u3+5bKK5zC1oC8inws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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