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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dc95a3e60420b8969e0d5b8f8bfd0d26edae824f88a0b84a9bcc75f1227e575' 
  AND token = 'kBeEnwXNhJOCMiT4XenXDKYuVkfkcWBCyP1jhT+08Do=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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