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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '948eb0e5be14196d61b6841dbc3447cea8ed07e00c54885733b080994889f8dc' 
  AND token = 'qHVwgvwJRDS144/UMSNugWB3ojXX4nqaa3ddZI7qjEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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