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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '470b865b45c8a555fb7d777082cc942acf734482ce42f5097424a8154fa808e7' 
  AND token = 'TVy5fNiG0FVE/17sTgOw4P//dcDPhcYZScBSfVV6fPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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