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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cbb55a4867d6a1ce271e892e58ea21482c40617e24ba29eb8549aaabfe081c4' 
  AND token = '/lmKCOgeSLS3Jq5YHRR6akBcr578pARA0+A5XYS7CVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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