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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '190bf364bf4bdf1caaad214c23c0fcb340eccb275314cd3d903c1a32ef27cd2d' 
  AND token = 'Sjwh+GLSm0tMIVZUD41Cgu1u9pL5hb1oZGZysDVoQBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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