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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd53a07c5977de1a44362d335a6e956ff9c9a8e2f91b4c535a04dd95d5321e7e8' 
  AND token = 'FoqDEX5Ku2SVvf6LAdENuq8Yyva9NpX/SRF5vyAQv6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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