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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa8e140ef3d8a49bbd872286443972509c9603ac8c76feaa3dccfb554d3de5cb' 
  AND token = '8u/pwL5f2wQQoDkbo1b5p2wEZn/9xICcyv2GVixaztM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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