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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '035e67e8928aba7df4becc3fc01434c02028d7471bacb692424faa9a2c47c1a3' 
  AND token = 'kwq10Z3XQ/J1g5pOK7VxVf++Kaj7dIdjM8jqAte5yak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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