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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b95934eea1dc628346293daba4a90ba51b8c126a89241406b8cbe9a9698a8f3' 
  AND token = '1LEzEmmx+ZrN1/k1pzigiW3937KOrhiUJwhZ2qONNBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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