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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef6c57e148e079d507c00e20597715318580dcd09caa3fdc4d3823dbe0aed3fb' 
  AND token = 'h61CFKfWDStPhxPAZBIj76XFQj/BmTjT236qUds/1Ow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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