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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '606260a2640ac94bd37a1fc81a83a8fb4251f8b3e3b8f9cb257c26a27e389bc3' 
  AND token = '91wgtkKycQTAHddEymXSdof/IDzIv6jMiuumscmv0kA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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