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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbac42ea0ce9bcf69f33ae50d3660c989909108001fae3ff91e70c81073f2e07' 
  AND token = 'ZxW4t27iV+IQxNNksv5piWKZ4bw8Suzdn9xevHj8+1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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