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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd28295fe8068f92cd77640685906e9a5703adc9dda719bab78db00385c162e0b' 
  AND token = 'vpG/A4PhEzb7PqQXrxLniiuPaIya602YExk6e8ScD88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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