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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab88c7aede604eb12cce73109f573057ff3dab399849d1d22033945096b9368d' 
  AND token = 'DYn6oWsDaXEVkLe216WcwcyZsOh4pfWGGb1ks+eisEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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