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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90633954b82b674586124782314be6f8651a3e892c9d21cc650247a375f4e317' 
  AND token = '34/eLFhYEyuJT9DNrjVUc6iRsuAkiJyf2JICBLRLLH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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