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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18af352f82e3a8c1a5e97e5b4fc4dadd8f67bd80eb4cf4b2bd5a6b64b363e8e4' 
  AND token = 'Wlybi5C6Tdzv/KOcRGUQoyBrJb/bLTvYDO5QLWUKLRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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