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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b372da677c57395cf3f28df92b8560dcf16eb36b8ad74efb3feab1c142b5ffdb' 
  AND token = 'RkAsnZyJb7qqoNnCX09Ic1znVGeWQ4ZFiv6uM3/Abtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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