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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad0f035f05975735c7a3c4041694b704eac34c3271406d01bc82c0b9809a0478' 
  AND token = 'b7e0XcqxxnWxUVksVzbWH6CBxN0V09gvS7jnK2jvZ+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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