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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afd7600e6ef124e305b90014f9b72c6ff6d36e0e25017a69e7ffa3ba2060ed3f' 
  AND token = 'jMRKW2go9VCbJtDIfOzKD+QuxD7F8nKBSawzSFVInSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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