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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8772de78cdb3cd89f7d68200d4ee285abc086967b6b2695c19f26dfd611e502' 
  AND token = '1CLTPSi47Y5rNkvDChVVSYKaBbYFp8MKXLJb4ENgl3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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