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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32b3f5fabbdb5b33e57e7aefca573d296169af6718698d9bebd5009df878245d' 
  AND token = 'OVOdMMP4K5x0aDWzQSAB7/b0MKeFJk4AoaUyo1QkXPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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