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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f7d9bca783bbb8c5a5aef0d14e7caf684c79f65486d4d081a3327014ceea68f' 
  AND token = 'HtFLrA5c9u5vjy/c0vXcObXxrwpz4v/lpSH7gEVFxEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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