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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '068f14b7100349c2e0c199fa36bfcae8fd863ae3773e9b2fc88be04e56eae74d' 
  AND token = 'xiFHzsMt0hX0NYg9RWwScJOEqfk3tiffGPYYfLvJaI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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