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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '593b9b54a7b7fa9eebe558de0d5f61bcdaf80407b81b25c8524efe665b231e02' 
  AND token = 'jaD7l74Jt0m8eGRL/05Z0QU4oYWi2AEsfiP1NhpEt+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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