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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c06cfb7d479b698eb667cc9fbb7f2b07471acfd3d2ab2a980a2737cd56cd0d86' 
  AND token = 'U3byeomOn/N1PCHY/kZ+yZ+2TpT6Rd91VQ3BuNspF40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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