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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae72b95a75137b221c18ac0d0de6c2f2a6d5f592deb9fdf6af060e6250c05be6' 
  AND token = 'Hkopbhq1CYT4DStnVazFZRNkWJFVEB4FQreTTRcdCdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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