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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4843164999fe1e56a82ca398ab65a4228933b6afe50f621e81a75efd3e51b5d' 
  AND token = 'tso7hyD3FgiGk/CQX6Eb7nrSXrBaaIIXN6Yc5Xd8Ed0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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