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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99df232bfe04f049ae7a970c5005f3fc4caa0ab25315b2ee02e79ee00ea95433' 
  AND token = 'rmswsa5ay6Lwc9/6o7EDmzncRAw8D/5dlxubLOf+WPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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