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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f742d171b8daf8b3b474f6de56575e8f59b9e05a9b30f1ad1f9cd0ef3fa6d5dc' 
  AND token = '0Ep+y3rDZn6I9TSjl9cXNmicEEpfSISya4rrhqgBaH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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