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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b40a4d8ef9976d2d3270647880092b5cdf7d6c191b9967acc86239979b08805' 
  AND token = 'zm4cxpt5KKt0+fMDUtlyTGhMw1MIGm0tbJ8NCRDtd/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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