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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c4854db80980bb8ff28b10bf82682caf5c77b62c20655babe50ef6614600fbc' 
  AND token = 'gOzn2czl/zo0y39xj3K+3qHK5ZKDVWbVPjNI/lKVP5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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