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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e07768f4b74e010f424ed3d3c7585565c2e2d33dcf4f33e8a8ee653fa815c282' 
  AND token = 'pZKAk96QISsHX4li5Cgpa9C5CR6IUeI8uBPKvEICNVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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