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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be13d2ef5cbed5be1d4d2232a2026ccc76975173b42e3fe3cf4cc2e2eea2db46' 
  AND token = 'Y7uMgeQvogC+ZyqZei1vc35O5+ca9ok7oHpZXvuiUx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00080

JSON explain

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