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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04fba2686edb580a03c63329cff97dacdc1c0f169c1b9b6fd6be8d56f8d3aa09' 
  AND token = '1AhaQYE+vIE6+fwhCduHNmFGutDDoIai8qKNYg3lPpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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