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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '949fa03337aae07c531dbb9fc1e003538f481fea9d06060e81f3d190539a3e70' 
  AND token = 'WLI4K6ZfFgU5jThvVdSpetkjjqGBR9vpg2/vw53Ktzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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