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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43adfc0635ab540f85b51bce41f2478307d1139584cf58db87bda128f21e1563' 
  AND token = 'c+rWkrTvtme8mysy1NB8fSN+OygvBOvhx9QBfM3cOV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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