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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97c084a74029f05f1820ce1ab8504abf0d82f8c8d88ee2e507f165ed2543e374' 
  AND token = 'yytMkooJHvtjiXui6CsrX7H0jyHQet+Btupsqxeal6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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