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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb3900c28da60c2fbe0987a6d7cc8dd82347e0ce1dccc5cafe24cd77bd062a73' 
  AND token = 'RzFaMQTIC9dfACpcMpcCNqLsJlgWkzcbdGe+LN881Sc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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