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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa83707be87a90ea1631821247b92c644a9bb2f9d72442aa8c4fc222c5a112bd' 
  AND token = 'a93dcl+1Q5FnzAeG93bRIm2SEj5ez22fjTK8DNnpmYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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