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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8632564c0f99e819c689d6c105a013f01869bb3f4902112a5a1dc5b8e1cac24b' 
  AND token = 'XwAgevaT/yzO2dZfFDHCUdkRUD5nk8eNwzsvqfqsHpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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