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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '892ec685889cdd051a8961d9c43c53c3e1235e6a62128921c988109515ea8957' 
  AND token = 'od2GukkNhm9h4vBPCOyYC4EGQeqIeifzZu9g3w5hDds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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