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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '302c79ba9322a2e38e889901a905e19f879c2dddbb2522fdb4a1f650ae858e27' 
  AND token = 'aY/dhgfZdJq/Azit6rvbcKz2+N/ONKDd11N801jvLv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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