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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dad00904b5ded63dc69a77c548aad419c4f149e48d6f52b2446796ebc44f725' 
  AND token = 'IzKYpu3JF2C2m58yeNoypU9OjH6XrtuZPKdfrpOT0a0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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