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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49c632ee7a98fc2b08211b16a97228eb6e44c5aa7d384b0be43096cf8cacc9aa' 
  AND token = 'qEo5LMj8xTT9V79m1XEEkSLiKnWbBc1rgKERtFViQHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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