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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cebdc4292b75cffd5a4404ff3cd7bdc0b671022bcb118460317ff23a293648c5' 
  AND token = 'Or9K3bnJV8SgKQZT9CiNTm5W7l7xIXlzgcVgrf0G47k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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