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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5442fe5ac6c67de30a505664b10d58ee07d80a90d65d6a3755fa32afd5ee665' 
  AND token = 'c1P4tdB4IcCuMoFJS6EUIk6AN8BpiQGVvecUk/4W1/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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