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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '068cce17d89d845f2306eadf38842aa6794511b5e40c73de97bae0481c88a174' 
  AND token = 'ZEdDzNWP53TUXs9jf2ejtWICg3anfgHcIwYsSUwzR7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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