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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6b15a7c5d7fb53976ba04eb9b8b2f6c38d641918a93eafcc9412350b3d6e3ce' 
  AND token = 'ygT6OKaPz/+Vh5z/TdZCi5ppZZLq3rPTHkV69a+WAko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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