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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd04904d7d31364472b71a08ab987a373dfc7dc5ba86b804f87a21d786565aa3' 
  AND token = '2mTWzxd68QkhrFgM28Gb2uji1HFS83JXu5PWSqse08Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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