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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f24a0bb9164aaecebac4976cc8e202424dcdb4a13b32386d75675c86d05f5d66' 
  AND token = 'dnDtMqZaMUGOogfHSpTH9e2FBnb0sZfkW0aiwm3q+yQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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