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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5db4697d3b9e1ed8877c298e6bc53aecada792b2092342dca43061c487274ef' 
  AND token = 'E1q+DPIoxpZV46tWUMtz8ACNlN2re/vnCCTNRn7mf9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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