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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbf1ca8eaa8f5cd86a0337cd4882d91e6f2d84c0605fe52f4b8e3faf0abfcd89' 
  AND token = '8AiG3Cu1vgKP8T+52Hk1W2+L3mMGj+qfp7Heyz8kZLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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